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Quarterback Aaron Corp of the USC Trojans looks to hand off the ball during the game against the Washington Huskies on September 19, 2009 at Husky Stadium in Seattle, Washington. The Huskies defeated the Trojans 16-13. (Photo by Otto Greule Jr/Getty Images)

IRVING (CBSDFW.COM/AP) – The Dallas Cowboys have signed quarterback Aaron Corp, twice released by Buffalo after joining the Bills as an undrafted free agent last year.

The Bills released Corp less than a month after signing him in 2012. They re-signed him in February and let him go him again on April 29.

Corp was set to be the starter at Southern California in 2009 but broke his left fibula before the season, leaving the door open for eventual stater Matt Barkley. He transferred to Richmond in 2010 and started five games before suffering a season-ending knee injury. He finally played a full season in 2011, throwing for 2,682 yards and 17 touchdowns.

Corp was a teammate of Cowboys left tackle Tyron Smith in his time at USC.

Kyle Orton is the current backup quarterback to Cowboys starter Tony Romo.

Former Tarleton State quarterback Nick Stephens and former Akron quarterback Dalton Williams, who recently signed on as an undrafted rookie free agent, are also in the mix.